BOSTON - With the campaign jabber of the 2008 elections already getting loud, an organization that promotes transparency in politics hopes one slice of the Web can promote reasonable, intelligent debate about issues. The Center for Responsive Politics is working with Web startup Helium Inc. to spark public discussion on such topics as "Should there be spending limits on political campaigns?" and "Should members of Congress be allowed to add earmarks to appropriations bills?" The Web is full of opinions on these and innumerable other matters, of course. What sets Helium apart as a soapbox is that the items voted...